imx8m(n): garbage on serial line

[Heiko Thiery]

Hi Fabio,

Am Mo., 13. Juni 2022 um 16:27 Uhr schrieb Fabio Estevam <festevam at gmail.com>:
>
> Hi Heiko,
>
> On Mon, Jun 13, 2022 at 10:54 AM Heiko Thiery <heiko.thiery at gmail.com> wrote:
>
> > This is the output on the kontron bl-imx8m board:
> >
> > U-Boot SPL 2022.07-rc4-00007-g8c3f838be2 (Jun 13 2022 - 15:36:08 +0200)
> > Kontron SL i.MX8MM (N801X) module, 1 GB RAM detected
> > Touch controller detected, assuming LVDS panel...
> > Normal Boot
> > WDT:   Not starting watchdog at 30280000
> > Trying to boot from MMC2
> > NOTICE:  BL31: v2.4(release):v2.4
>
> Just tried with the same v2.4 TF-A version:
>
> U-Boot SPL 2022.07-rc4-00007-g57bd363de7 (Jun 13 2022 - 11:18:10 -0300)
> Kontron SL i.MX8MM (N801X) module, 4 GB RAM detected
> Normal Boot
> WDT:   Not starting watchdog at 30280000
> Trying to boot from MMC1
> NOTICE:  BL31: v2.4(release):v2.4
> NOTICE:  BL31: Built : 11:17:34, Jun 13 2022
>
>
> U-Boot 2022.07-rc4-00007-g57bd363de7 (Jun 13 2022 - 11:18:10 -0300)
>
> CPU:   Freescale i.MX8MMQ rev1.0 1600 MHz (running at 1200 MHz)
> CPU:   Industrial temperature grade (-40C to 105C) at 60C
> Reset cause: POR
> Model: Kontron i.MX8MM N801X S
> DRAM:  4 GiB
> Core:  175 devices, 25 uclasses, devicetree: separate
> WDT:   Not starting watchdog at 30280000
> MMC:   FSL_SDHC: 0, FSL_SDHC: 1
> Loading Environment from SPIFlash... SF: Detected mx25r1635f with page
> size 256 Bytes, erase size 64 KiB, total 2 MiB
> OK
> In:    serial
> Out:   serial
> Err:   serial
> Net:   Could not get PHY for FEC0: addr 0
> No ethernet found.
>
> Hit any key to stop autoboot:  0
> => [55;203R
> Unknown command '[55' - try 'help'
> Unknown command '203R' - try 'help'
>
> and the serial garbage is seen.
>
> My version has 4GiB of RAM, yours has only 1GiB.
>
> Could this make a difference?


I can hardly imagine it. I don't have an explanation for it.

>
> Thanks